1969 435HP auto transmission pan - NCRS Discussion Boards

1969 435HP auto transmission pan

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  • Jeff D.
    Expired
    • April 30, 1995
    • 95

    1969 435HP auto transmission pan

    Is this the correct transmission pan for my 1969 435HP auto? If so, it appears to be painted with a light gray paint. Is that correct or did someone do that to it in the past? Thanks, Jeff
    Attached Files
  • Terry M.
    Beyond Control Poster
    • September 30, 1980
    • 15601

    #2
    Re: 1969 435HP auto transmission pan

    Yes that appears to be the correct configuration although a side view, or closer to a side view would be helpful. Original finish was a light gray plate that I think is tin plate, but others may have a different opinion. It definitely was not originally painted.
    Terry

    Comment

    • Richard M.
      Expired
      • April 1, 1993
      • 198

      #3
      Re: 1969 435HP auto transmission pan

      Also the vacuum modulator assembly should be painted black. Richard

      Comment

      • Chuck G.
        Extremely Frequent Poster
        • May 31, 1982
        • 2034

        #4
        Re: 1969 435HP auto transmission pan

        Originally posted by Jeff Derry (26074)
        Is this the correct transmission pan for my 1969 435HP auto? If so, it appears to be painted with a light gray paint. Is that correct or did someone do that to it in the past? Thanks, Jeff
        I'm not so sure that it should have the Hydromatic embossings. I thought originals were perfectly smooth....no embossments.

        Chuck
        1963 Corvette Conv. 327/360 NCRS Top Flight
        2006 Corvette Conv. Velocity Yellow NCRS Top Flight
        1956 Chevy Sedan. 350/4 Speed Hot Rod

        Comment

        • Chuck G.
          Extremely Frequent Poster
          • May 31, 1982
          • 2034

          #5
          Re: 1969 435HP auto transmission pan

          Smooth like this.....

          Chuck
          Attached Files
          1963 Corvette Conv. 327/360 NCRS Top Flight
          2006 Corvette Conv. Velocity Yellow NCRS Top Flight
          1956 Chevy Sedan. 350/4 Speed Hot Rod

          Comment

          • Greg L.
            Extremely Frequent Poster
            • March 1, 2006
            • 2291

            #6
            Re: 1969 435HP auto transmission pan

            I think Chuck is correct. I think the "Hydramatic Div of GMC" came much later and was a later service replacement pan.

            Comment

            • Jeffrey S.
              Extremely Frequent Poster
              • May 31, 1988
              • 1882

              #7
              Re: 1969 435HP auto transmission pan

              Chuck,Do you know if this is the original vacuum modulator or a replacement? Although my car is a small block, the pan is exactly as yours is and it is original to the car. Attached is a photo of the pan from my '69
              Jeff
              Attached Files
              Last edited by Jeffrey S.; December 1, 2013, 01:50 PM. Reason: Added picture

              Comment

              • Ralph S.
                Expired
                • February 1, 1985
                • 935

                #8
                Re: 1969 435HP auto transmission pan

                My L/71 M/40 VIN 38161 Built 12/11/69 has a smooth pan with 2 dimples and a metal flywheel cover unlike the plastic one in Chuck's photo

                Comment

                • Terry M.
                  Beyond Control Poster
                  • September 30, 1980
                  • 15601

                  #9
                  Re: 1969 435HP auto transmission pan

                  Originally posted by Ralph Spears (8296)
                  My L/71 M/40 VIN 38161 Built 12/11/69 has a smooth pan with 2 dimples and a metal flywheel cover unlike the plastic one in Chuck's photo
                  I guess I have learned something from you guys today. Thanks.

                  What about the vacuum modulator? I remember one of the TH400s I had used a larger black can, but that may have been the 1967 GMH 3/4-ton pick-m-up.
                  Terry

                  Comment

                  • Chuck G.
                    Extremely Frequent Poster
                    • May 31, 1982
                    • 2034

                    #10
                    Re: 1969 435HP auto transmission pan

                    Originally posted by Jeffrey Salz (13182)
                    Chuck,Do you know if this is the original vacuum modulator or a replacement? Although my car is a small block, the pan is exactly as yours is and it is original to the car. Attached is a photo of the pan from my '69
                    Jeff
                    I cannot answer. I don't know about the vacuum modulator.

                    I am 99% sure I'm correct about the pan, however.

                    Chuck
                    1963 Corvette Conv. 327/360 NCRS Top Flight
                    2006 Corvette Conv. Velocity Yellow NCRS Top Flight
                    1956 Chevy Sedan. 350/4 Speed Hot Rod

                    Comment

                    • Michael H.
                      Expired
                      • January 29, 2008
                      • 7477

                      #11
                      Re: 1969 435HP auto transmission pan

                      Originally posted by Terry McManmon (3966)
                      I guess I have learned something from you guys today. Thanks.

                      What about the vacuum modulator? I remember one of the TH400s I had used a larger black can, but that may have been the 1967 GMH 3/4-ton pick-m-up.
                      Terry

                      I'm pretty sure that the large black modulator was used for all TH-400 transmissions from 65 to at least 1969. Possibly later.
                      Last edited by Michael H.; December 1, 2013, 06:46 PM.

                      Comment

                      • Chuck G.
                        Extremely Frequent Poster
                        • May 31, 1982
                        • 2034

                        #12
                        Re: 1969 435HP auto transmission pan

                        Originally posted by Ralph Spears (8296)
                        My L/71 M/40 VIN 38161 Built 12/11/69 has a smooth pan with 2 dimples and a metal flywheel cover unlike the plastic one in Chuck's photo
                        Don't know about the plastic vs. metal flywheel cover either, Ralph.

                        I can say that my 69 was judged many times, at both Regionals and Nationals, and nobody mentioned anything about the pan or flywheel cover. That being said, in all honesty, those would be tough to see laying on the floor judging a chassis.

                        Chuck
                        1963 Corvette Conv. 327/360 NCRS Top Flight
                        2006 Corvette Conv. Velocity Yellow NCRS Top Flight
                        1956 Chevy Sedan. 350/4 Speed Hot Rod

                        Comment

                        • Terry M.
                          Beyond Control Poster
                          • September 30, 1980
                          • 15601

                          #13
                          Re: 1969 435HP auto transmission pan

                          Originally posted by Michael Hanson (4067)
                          Terry

                          I'm pretty sure that the big black modulator was used for all TH-400 transmissions from 65 to at least 1969. Possibly later.
                          My memory is that sucker had a date code stamped into it too.

                          On the other hand the point Chuck makes about some of these details being hard to see is valid; but the TH stamping on the bottom of the pan should be a no brainer.
                          Terry

                          Comment

                          • Joe L.
                            Beyond Control Poster
                            • February 1, 1988
                            • 43221

                            #14
                            Re: 1969 435HP auto transmission pan

                            Originally posted by Michael Hanson (4067)
                            Terry

                            I'm pretty sure that the large black modulator was used for all TH-400 transmissions from 65 to at least 1969. Possibly later.
                            Michael-----


                            Yes, the 1965-70 modulator valve (of course, just 68-70 for Corvettes), GM #8625976, was painted black. The 71-72 valve, GM #3963812, which also replaced the 8625976 for SERVICE in July, 1970, I believe was also black painted. The 73-75 valve, GM #3027222 which also replaced the earlier year model valves for SERVICE in September, 1972 was also black-painted.

                            In December, 1988 the 3027222 was discontinued and replaced by GM #8629941. I don't know if this valve was painted, or not. It was discontinued without supercession in September, 2000.

                            Of course, the valves supercessive to the 8625976 were configured slightly different than the 8625976


                            A valve is available from GM or Delco today, though. I don't know if it's OEM-quality, or not, since it does not trace its lineage to the OEM valves. It's GM #89057785.
                            In Appreciation of John Hinckley

                            Comment

                            • Joe L.
                              Beyond Control Poster
                              • February 1, 1988
                              • 43221

                              #15
                              Re: 1969 435HP auto transmission pan

                              Originally posted by Chuck Gongloff (5629)
                              Don't know about the plastic vs. metal flywheel cover either, Ralph.

                              I can say that my 69 was judged many times, at both Regionals and Nationals, and nobody mentioned anything about the pan or flywheel cover. That being said, in all honesty, those would be tough to see laying on the floor judging a chassis.

                              Chuck

                              Chuck-----

                              The original 1968-69 Corvette THM-400 converter underpan was GM #3868810. It was definitely of stamped steel construction. That underpan is still available today under the original part number. Is it still metal? I don't know but it would be unusual for a part to change from metal to plastic without a part number change. It is possible, though. In any event, stamped steel reproductions are available and the used market ought to have PLENTY of these available. They were also used on THM-400-equipped passenger cars from 1965 to 1969. 1970 and later are different, though.
                              In Appreciation of John Hinckley

                              Comment

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